Nut-lock.



H. E. KITTREDGE.

' NUT LOCK.

APPLIOATION IILED MAR. 2a, 1908.

946E556 I Patented Jan. 11, 1910.

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HENRY E. KITTREDGE, OF BOSTON, MASSACHUSETTS.

NUT-LOCK.

To all whom it may concern:

Be it known that I, HENRY E. KITTREDGE, a citizen of the United States,residing at Boston, in the county of Suffolk and State of Massachusetts,have invented a new and useful Improvement in Nut-Locks, of which thefollowing is a specification, reference being had therein to theaccompanying drawings.

My invention relates to devices for locking bolt-nuts and the likesecurely against dis placement and the object of my invention is toprovide a nut-lock which may be easily applied to and removed from thenut and which, when applied to a nut, will effectively lock the nut inposition and prevent it being loosened or displaced by vibration,jarring or other cause.

The following is a clear description of my invention, reference beingmade to the accompanying drawings, in which like numbers refer to likeparts throughout the several views, and in which:

Figure 1 is a side elevation of the nutlock; Fig. 2 is a side elevationof a nut and bolt to which the nut-lock may be applied; Fig. 3 is a sideelevation of the nut-lock applied and secured to the nut and bolt shownin Fig. 2; and Fig. i is a vertical sectional view partly in elevationof the nutlock applied and secured to the nut and bolt shown in Fig. 2.

My invention consists broadly in a screw having a left-handed thread anda broad head of malleable metal adapted to be turned down against theside or sides of the nut to which the lock is applied.

In the drawings illustrating the preferred form of my invention, thenutlock is made up of a head-portion 1 and a screw-portion 2 providedwith a left-handed thread. A bolt of ordinary form is also shown with ahead 5 and a pin-portion 6 having a righthanded thread on its end,together with a nut 10. If, for any reason, the thread on the bolt isleft-handed then the thread on the screw-portion 2 of the nut-lockshould be right-handed, since they are intended to be opposite threads.The diameter of the headportion 1 must be greater than the diameter ofthe nut to which it is designed to be applied and the holding power ofthe nut-lock will, of course, vary with the extent to which the edges ofthe head portion 1 overlap the sides of the nut. In order to apply myde- Specifieation of Letters Patent.

Application filed. March 26, 1908.

Patented J an. 11, 1910*.

Serial No. 423,330.

vice to a bolt for the purpose of locking the nut, it is necessary toprovide the end of the pin-portion 6 of the bolt with a longitudinalbore 12 having an interior left-handed thread. The head portion 1 of thenutlock should be of stout malleable material in order that it may bebent over to look the nut, and should not be so soft that the twistingstrain exerted by the nut will be liable to bend it.

In actual use, my nut-lock is designed to be applied and to operate asfollows. The bolt-nut 10 is secured on the pin-portion 6 of the bolt andthe screw-portion 2 of my nut-lock is then screwed into the bore 12until the head-portion 1 contacts and binds the nut 10. When thenut-lock has been turned until it contacts and binds the boltnut 10 itwill be found impossible to turn the bolt-nut to unscrew it from thebolt since the more it is turned for that purpose the stronger it bindsagainst the nut-lock. After the nut-lock has been turned until it bindsagainst the bolt-nut the edges of the head 1 of the nutlock are thenbent over as shown in Fig. 3 against the sides of the bolt-nut 10. Itwill, in most cases, be sufiicient to turn over but av small portion ofthe edge of the nut-lock against one side of the boltnut, but ifnecessary the entire periphery of the head of the nut-lock may be turneddownwardly over the sides of the bolt-nut, irrespective of whether thebolt nut is square, hexagonal or other form. When the bolt-nut is thuslocked it will be impossible for it to jar loose as any unscrewing movement of the bolt-nut simply causes the nutlock to be screwed down moresecurely to the bolt-nut.

The nut-lock may be removed by turning up the edges of its head from thesides of the bolt-nut whereupon it may be unscrewed with the fingers.The head of the nut-lock is provided with a recess 14: to receive ascrew-driver in order to facilitate the adj usting and removing of thenut-lock.

What I claim is 1. In a nut-lock, the combination of a bolt having athreaded portion and provided with a central longitudinal threaded bore,the thread of said bore being the reverse of the thread on the outsideof the bolt, a nut threaded on said bolt and a lock having ascrew-portion threaded into said bore and a flat head-portion of largerdiameter than the diameter of said nut adapted to be bent over the sidesof said nut to lock the same when in position.

2. In a nut-lock, the combination of a bolt having a threaded portionand provided With a central longitudinal threaded bore, the thread ofsaid bore being the reverse of the thread on the bolt, a nut threaded onsaid bolt and a lock having a screw-portion threaded into said bore insaid bolt and a fiat malleable head of larger diameter than the threadof said bore being the reverse of thethread 011 the bolt, a nut threadedon said bolt and a look having a screw-portion threaded into said borein said bolt and a flat, circular head-portion of malleable ma terialand of larger diameter than the diam eter of said nut and adapted tohave its projecting edges bent over the sides of the said 7 nut to holdit in a locked position.

In testimony whereof, I hereunto set my hand, in the presence of twosubscribing Witnesses, this the tenth day of March, 1908.

HENRY E. KITTREDGE.

Witnesses:

LUTHER A. I-IoDeDoN, E. F. UNIAC.

